What do I search to find a certain person on twitter?
Search her by using her username including @ before her name...as for example you can search me on twitter go to search box of twitter and write @webexpertzin you will find my profile.
How do you tweet at a certain search on Twitter?
Put, hashtag and use the name.
Is there anyway of blocking certain followers on Twitter?
If they are actually following you, yes you can block them but you have to do it from their profile.
How to Send Only Certain Posts to Twitter From Tumblr?
Integrating your Twitter account with your Tumblr blog is an easy way to increase exposure and visits ti yiur bkig posts. Tumblr provides a feature that lets you automatically sync your blog posts ...
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Can you see what person watched your vine (twitter)?
No. they won't know that you watched their Vine.