put image over links
or use font same as background for the links
or use small font

Hidden links are still counted as backlinks as long as it's live but you should also aware that it's not a good practice.

do u know about Link Cloaker ...try it ...i think this helps u a lot ....

If you want to put hidden links on website then use same font color as web page background color, but aware it because it is a black hat techniques according to SEO techniques.

1. you have many choice to hide your link

A. make the font color same to the background color
B. make the font almost invisible.
3. make one pixel link

2. yes it count as a backlink ..but it will good for seo

because youtube is a very renowned website

Any of the above mentioned link hiding techniques (including the cloaking suggestion) are an easy ticket to having the web pages in question demerited. I'm not saying that the search engines won't find out about it, I'm implying that it is likely that the search engines will most likely determine that your link is being hidden and thus devalue the web pages accordingly.

It is all based on simple logic, if you want to hide something from the Internet visitor but want to make sure the search engine finds it for "SEO" purposes then, the link really isn't of any value. The search engines are pretty swift to recognize this and in most cases will slap your web site promotion efforts with the appropriate penalty.

Ultimately, these "black hat" techniques could lead to a very low PageRank and hurt the client's ranking on SERPs.

Don't try to hide anything.. even the links.......because at some point of time.it will only ruin your rankings and overall position of your website in search engine.

This is unethical tactic of promotion and not recommend from the SEO point of view.