Content it king and the amount of likes and retweets any given social media post garners increases dramatically by including great images. Twitter posts with images generate 150% more retweets than tweets containing just text. The flux of social networks that base their utility on images is growing by the day. Vine, Instagram, Wonder PL, Stellar, Pinterest and many others are solely driven by visual content.
Pic Monkey: allows you to edit photos and collages in very creative ways. Play around with this, you may be surprised about how many cool things you can create if you add some fantasy to it.
Social Image resizer tool: Make sure your images are resized for the sites you want to use them on, whether it is creating a Twitter profile picture or a Facebook header. It is important that your images appear as you want them to and not look stretched or out of focus.
Timeline Slicer: Customize images by uploading and adding them into a Facebook page through this site. You can adjust and view how your or your company's Facebook site will look. When you are done you can download them and upload them into your real Facebook profile.
Photovisi: A website that allows you to make photo collages fast and easy without having to create an account. The images are easily sharable.
Be funky: Allows you to edit images online and grab photos from a variety of social media accounts in addition to your own computer. You can eliminate red eyes, blemishes, crop images and apply filters as you like.
Visual.ly: Info graphics are an increasingly popular way to share stats and research findings in a compelling manner. Easel.ly, pictochart and infogr.am are other sites that make infograms free of charge.