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This is exactly what Comic Sans was made for: a brief blurb of text that's meant to look playful rather than formal. Comic Sans actually works better than Chalkboard for that purpose.

Comic Sans is hated because it's overused, but don't take from that that there are no good uses. There is only one.

I presume that is exactly the point. If it becomes an open, federated, distributed, open source, social bookmarking (any more buzz words?) service, you don't have to trust them with anything. Really, that is possibly the only way they could ever recover any semblance of trust.

I don't think that you should reason too much from the font somebody uses. Plenty of successful websites started out with an amateurish look and for some of them it's still a trademark.