My position is quite the opposite: I put the symbol on my LinkedIn profile (and removed it from the URL) and WhatsApp profile.

I never dared to start a discussion about effective giving myself, but thanks to this, people around me started the discussion for me ("Oh, what does this emoji means btw? What's the 10% pledge?"). I've been impressed at how curious, supportive and positive people were, and didn't feel like proselytizing anything while doing so, merely answering their curiosity. And I'm speaking as someone who went as far as hiding my signing the pledge to my non-EA surrounding up until that point.

I don't think anyone one the EA Forum would get interested in effective giving through this, and I actually don't support targeting EAs first -I'd consider it a better outcome if people outside the community see the emoji as opposed as within the community. I think that EA has to be very outward facing, or it will fail.

(copying my comment from Jeff's Facebook post of this)

I agree with this and didn't add it (the orange diamond or 10%) anywhere when I first saw the suggestions/asks by GWWC to do so for largely the same reasons as you.

I then added added it to my Manifold Markets *profile* (not name field) after seeing another user had done so. I didn't know who the user was and didn't know that they had any affiliation with effective giving or EA, and appreciated learning that, hence why I decided to do the same. I'm not committed to this at all and may remove it in the future. https://manifold.markets/WilliamKiely

I have not added it to my EA Forum name or profile. Everyone on the EA Forum knows that a lot of people there engage in effective giving, with a substantial percentage giving 10% or more. And unlike the Manifold Markets case where it was a pleasant surprise to learn that a person gives 10+% (where presumably a much lower percentage of people do than the EA Forum), I don't particularly care to know whether a person on he EA Forum does effective giving or not. I also kind of want to avoid actively proselytizing for it on the EA Forum, since for a lot of people trying to save money and focus on finding direct work instead may be a more valuable path than giving a mere 10% of a typical income at the expense of saving faster.

I have not added it anywhere else besides my Manifold Markets profile as far as I recall.

The only problem is that no one knows what this means. Something easy would be to enter the definition on Urban Dictionary. I tried, but I am having server issues right now.

Personally, I find the idea somewhat odd/uncomfortable, but also vaguely buy the impact case, so I've only added it on LinkedIn, as that's the social network where I feel like the norm is shameless signalling and where I tie it least to my identity - I may as well virtue signal rather than just bragging!

Honestly it seems kind of weird that on the EA Forum there isn't just a checkbox for this.

I'd be very surprised if the downside of the initiative were significant in any way, but it seems like the upside potential is quite high, so I've included it in all of my social media. 

If you perceive any sort of downside from it, you can always remove it again.

Emojis in display names feels like a Twitter-native phenomenon. I think it works on Twitter because of the distinction between a @username and a Twitter handle: the latter can change frequently and is often used for jokes or puns anyway. 

So the orange diamond emoji fits in well on Twitter -- even "Jeff Kaufman 🔸🏗👣🛝💡🌎", while a little over the top, wouldn't strike me as too unusual. But in most other settings (EA Forum, Facebook, LinkedIn, etc), where there's less or no distinction between real names, usernames, and display names, an emoji stands out more. (Although 🔸 is visually simpler and more professional-looking than 🛝, at least.)

A candidate rule of thumb: use the 🔸 in situations where you're fine with people using other emojis, and don't use it if it might start a slippery slope toward 🔸🏗👣🛝💡🌎 where that would be unwelcome. For me that means ... just Twitter, I think? And maybe the EA forum where it's already catching on and doesn't seem to be spurring other emoji-use.

Just on this point:

Relatedly, it feels like this is not what the username field is for. If I'm interacting with someone on some topic unrelated to my advocacy it feels intrusive and uncooperative to be bringing it into the conversation

I think this argument might have a lot of power among folks who tend to think of social norms in quite explicit/analytical terms, and who put a lot of emphasis on being cooperative. But I suspect relatively few people will see this as uncooperative/intrusive, because the pin and the idea it's advocating are pretty non-offensive. 

I personally think of it similarly to wearing my pledge pin irl. I don't use emojis to signal anything else.

Imo I'd only really push you to add it on LinkedIn:

• Users are often wealthy or status seeking people doing business development work
• LinkedIn is a reasonable place to signal association with a particular brand ie. Giving What We Can.
• If you've got an impressive / high status CV then that adds credibility to GWWC
• It is a marketing to a more risk averse segment and signalling that this is already a movement with momentum
• It makes it less cringe for future pledgers to add the emoji and perhaps do further advocacy for effective giving

Personally, I've added the diamond in my LinkedIn, Forum and local EA slack profile.

People on LinkedIn can check my description if they are curious about it.

Haven't noticed any downside yet (although it would be hard to know).

It's just that I feel like the culture of not showing our donations is not a good thing. It leads us to think nobody else donates, so we donate much less than we would have done otherwise. So it's worth signaling that yes, people are donating.