How to get likes and retweets?

Make group/contacts and ask them to like and retweet and you can offer same for them!

You can start a group to follow each other and do that for each other also. It's a win-win.

There is a lot of websites which offer this or you can find some cheap offers at seoclerks dot com
But it is stupid thing to do.
I never used this services and my posts are constantly being liked and retweeted.
Just bring value to your posts, lots and lots of value...
My quotes are even being used by great CMO's, even on big seminars.
If you share cool stuff, everyone will like it.
If you need any help in online marketing feel free to ask me anything...

There are some good answers in this thread, but by far the simplest way to get likes to your facebook page/s is by inviting your other connections to visit, like and comment on the page and by promoting your page here on apsense as well.

The same goes for Twitter as well, invite your connections to follow you there, When you post content that is good, you will find that it will get retweeted, favourited and mentioned, as long as its not blatantly 'self' promotion.

The clues are in the names, s

The content you post should be attractive and interesting, and the exposure to a big crowd, people will give you a like,commend and share

From your account and Get them

http://www.apsense.com/article/top-free-social-media-exchange-websites-to-grow-boost-your-networks.html

Check out IBOexchange dot com