[amh]

6. You don't have a Twitter Account

Seriously? This would never in a million years have crossed my mind as a reason to avoid using something.

[iuygthn]

Depends on the product - this pitch is aimed at 'cool new web framework' type opensource projects.

If I'm looking for a heavy duty technical library, say 3D mesh generation or image processing I want someone serious behind - preferably with a full time academic job in the field and some papers, more than a twitter account and a cool logo.

[netherland]

Not a reason not to use. A reason I might have found you in the first place.

[michaelcampbell]

Perhaps, but the title is specifically "won't use".