A common way to get people to your Twitter, Facebook, or LinkedIn profile is to use their instantly recognisable badges on your websites and in your email signature. All of them provide variants of the badge so you should find one that works best for you:

Social media badges, logos and icons

Make sure you read and comply with the guidelines provided by each - as a business owner, respect the time and effort that they've all put into developing their brand by applying it as they ask. They are providing their services free of charge so it's the least you can do.

An alternative way to add the badges to your website and also to receive reports on how they are being used is to use a service like AddThis. Their website will allow you to choose from numerous styles and once you're done it'll give you the code to insert into your website.