Bhagirath Dhanani

We store your daily social and SEO Ranks, so you can report your website’s daily growth.
In this was you come to know day by day social share,like and rank.
Here is an example how it will store your data 
http://www.click2check.net/click2check?url=wordpress.org

Social Tracker

Track your website's social and SEO ranking data daily and know your sites growth.

rhewlif

Provides a simple sidebar widget to display NASA’s Earth Observatory Image of the Day and/or the RSS feed. Numerous options are available to display the content the way you want, including control on the image width and description.
The widget can also output just the RSS feed, providing links to previous images for up to the last 10 days (maximum available in feed).
Thumbnail images are cached to the plugin folder daily if needed, and the RSS feed is updated hourly.

Earth Observatory IOTD Widget

Provides a widget to display the NASA Earth Observatory's Image of the Day and/or the RSS feed on your sidebar.

Social Tracker vs Earth Observatory IOTD Widget