Hootsuite  - hootsuite users can access their social networking accounts from an application dashboard. as of now they are supporting some of the social networking sites (facebook, twitter, LinkedIn, Ping.fm, wordpress, mySpace and foursquare). Hootsuite has this ability to set pre-schedule on your postings and send it in advance. it can also sync the URL's that you will be posting.  you are also allowed to upload images and video files in your messages. the ability of connecting your rss is also so you can send blogs tour social media streams. you can also customize

Tweetdeck - tweetdeck is anapplication built using adobe air. it supports facebook, LinkedIn and mySpace. it can be available on your desktop, iphone and ipad. google chrome have tweetdeck also as extension. users can also customize the colors according to your needs. you can also decide who to follow or not and marks your favorites.

Netvibes - web-based network publishing tool that allows user to manage their facebook and twitter accounts in one interface. it has also RSS smart-reader that allows user to stream all the latest feeds. user can also personalize the interface. there are over 100 themes available so you are free to customize your dashboard the way you want. they also have large collection of widgets so you are free to drag and drop all the widgets that you will be needing. netvibes also support multi-publishing and it also supports full HTML.

Yoono - Yoono is a stand-alone or a browser extension tool that allows user to use their social networking accounts simultaneously without jumping from one tab to another. it has an ability to combine information from different external sources to create a new service. the current social media sites that is supported by Yoono are facebook, twitter, MySpace, LinkedIn, Friendfeed and Flickr. users are also allowed to share content, images and video from any site with your social network contacts by using the bookmarklet.

Flock - Flock is very much different from any social media aggregates for it is not a stand-alone application or a browser extension because it is a browser. it is a web-browser designed for social media aggregation. the sidebar is also reserved for your collection of people from different social media sites. it also centralize all your favorite feeds in one reader to keep your things organize. you can also customize it by installing your favorite firefox extensions.

Minggl - a web-browser toolbar that works with Firefox, IE, and Flock. the idea behind Minggl is to take control on your social networking sites in one place. unfortunately, Minggl is still on its invitation phase so if your planning to test it you will be having a hard-time.

there are plenty of social networking aggregators available on the web aside from the list presented above. their concepts are almost similar. some can be used as browser extensions and some are stand-alones and some can be used either of the two as you wish. you can view your lifestream from different social media and post to it simultaneously. they support different social media but they cannot cater all and unable to add new connections.