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hello, i would like to know how i could go about have a user click a button from there what ever is on the screen from the web cam is saved and tweeted with a preset hashtag
I'm not sure, but you could start by searching the forums for previous discussions of the Twitter API:
Please explore shiffman's tutorial as he explain how to do that. If you have any other question related to your topic, show your work or present a MCVE showing your approach.
Shiffman's relevant links: