You may in your sig, as you have already done. Unless it's for a specific forum/website that will assist in answering a question, it's considered advertising.
Anyway, if you're here to learn and contribute in the world of computer technology, this is one of the best places to do that.
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There are two secrets to staying young, being happy, and achieving success. You have to laugh and find humor every day, and you have to have a dream.