One thing that I want to chime in about and discuss is image size and image compression and optimization for speed purposes, as images are a significant factor in the page load time of the site. + Image optimization helps with site load speed.

Just a little different between the two types: PNG is better for crisp images with a low number of colours, and JPG is better for a low-bandwidth image - however it is not as crisp and therefore not very good to be used for the layout of the website.  Generally, JPG is for photos and pictures, whereas PNG (or GIF) is for website layout or for computer generated graphics.

Great resource here which is better for image compression and/or optimization if its of interest.

Not directly important to ranking but important in general sense of ranking.

Hell Netlover,

Its hard to say what is better depending on your needs. But one aspect to consider is the cost.  Hootsuite offers a great individual plan http://signup.hootsuite.com/plans-cc/ with which a lot can be accomplished for free.  Sprout Social on the other hand, has a free trial, but all plans include fees: https://sproutsocial.com/pricing.  From my use of both Sprout is more advanced tool for advanced social media analysis, and study.

Hope this helps, and what are some tasks you are looking to accomplish?

Also for a great review see this: http://digitalry.com/social-smackdown-sprout-social-vs-hootsuite/

Sales, and Reviews, do great things to help rank.

For more ideas: http://searchengineland.com/six-ways-online-retailers-can-better-optimize-listings-for-amazon-101752