One of the biggest dangers to artists who post their work online is the ever problematic issue of theft. This has been a big deterrent for many designers and artists to post their work in good faith. One of the answers to this is watermarking your work but to do this detracts from the designs and doesn't give your work the full impact it deserves.
This is what I've been keeping in mind whenever I make a design to post. I need to sign the piece and I don't want this to detract from the work so I try to make it as incorporated as possible.