But this is exactly what people do. Donating is not about helping others (in many cases) but to feel better for themselves. And people like to share when they feel better. I'd say we are, not so rarely, being nudged to donate, either by friends or coworkers who did this. I'm observing the change, in some circles, that makes you feel bad if you don't donate. Donating is something people talk about, bragging about, advocating for - it may not be signal per se but people are making it a signal.