Both ways are dangerous, but people usually easier to make friends online because you can lie easily, but most would prefer real life. Oh I barely make friends online.
I'd have to say online since I am somewhat of a quiet person most of the time (in real life) so it's kind of hard to "break the ice" unless I am familiar with someone really well. Once that's done, then I just can't stop talking sometimes.
Overall, I definitely like real life better... but I find it a lot easier online.