I only do "thanks" cos I do most of my browsing at work (oops) and its the only thing that works - if I try to like or give reputation nothing happens. The PCs here are weird and dont support all functions on lots of websites (for example on here, as well not being able to do "likes" and "reps" I also can't post a quick reply, or edit my posts, or see a lot of pictures (sites like Flickr and facebook are blocked, so any pictures hosted there just come up as a little white box with a red cross in it))
I do realise that I dont do a lot of thanks and things so I hope people arent too upset by that.