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When you send a message in Messenger, what does the circle with a check mark in the middle mean and why is one white and one dark grey?
What does SSL mean on twitter?
How to Whitelist Websites in Internet Explorer 8?
How does Facebook decide who to show who is offline and online in chat?
What is causing the Error 349 Duplicate headers received from server in Google Chrome with .pdf files?
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Can I hide my Facebook activity from certain people?
How do I place an advertisement on Facebook?