Please don’t randomly add people on Skype.
For some (including me), Skype is akin to a home, or even your room - and adding people on skype is akin to giving them free access to said place.
You don’t just give any random stranger access into your house on the pretense of “to try and be friends”. That’s why I’m on tumblr, and that’s why I visit streams and other stuff. Those activities are ones in which i venture out of my ‘personal space’, and you could approach me there.
But please, if I don’t even know you at all, don’t even try to ask to barge into my home. You are asking me to risk giving a total stranger a key to my place when i have zero idea who you are, with little to no benefit to myself if I do so. It’s rude, it’s kinda unpleasant, and chances are if you do this I would make note of it as a sign not to have anything to do with you.
And even if you do know the person, it’s still a very polite move to ask beforehand. I know, it must take a LOT of skill to put my username into skype’s search box and click search. Congrats. Unless we’re very close and regularly punch each other in the face as an affectionate gesture, don’t add without asking.
Lastly, of course - the home owner still makes the final call. I’m sorry if I reject your request, but it’s still my home and I choose who i want in it myself.