ORMs and ActiveRecord in particular encourage, to some extent, the use of a RDBMS, even if they didn't get to take advantage of them well for a long time - for example, in RoR "has_one / has_many" for foreign-key relationship, .joins(:field_name) for, well, joins, and so on.
A big reason I called out RoR is that back in '04-05 I was railing against its default use of plural table names, and DHH on IRC recommended I shut up and just flip the configuration switch and turn off the feature, but of course when I did that all sorts of latent bugs were exposed.
RoR was the beginning of hipster "coding" and I therefore blame it for everything.
I'm wasn't previously familiar with the FriendFeed approach to database (ab)use. I paid about as much attention to it as I did to MySpace back in the day -- nearly zilch -- so its etc innards are doubly obscure to me.
> MySQL was the perfect database for people who had no respect for databases.