Whereas, a wiki is a collaborative sharing platform that is more useful than blogs in terms of collaborative information between groups (eg. corporations and interest groups), in which every member gets to share information or even to edit existing info created by others as well.
In a blog, the author is generally allowed to post whatever they want. Whereas in wikis this is not always the case. According to Cohen on " Wikipedia to Limit Changes to articles on People" in 2009, wikis' "flagged revisions" feature will only allowed contributions to be added after they were revised by a volunteer editor. Cohen also states that millions of Americans visit Wikipedia every month. Therefore, flagged revisions would actually help prevent anonymous users from creating false content and/or from editing existing information with irrelevant, sometimes unreliable data.
Blogs, that are more personal than wikis, could also make a difference when it comes to the information being shared. In his article "Brooklyn Blog Helps Lead to Drug Raid", Michael Wilson explains how a blog actually helped lead to drug raid because users where sharing their personal thoughts and talking about what was happenings in the Bay Ridges' streets.
It can be said that both blogs and wikis can make it a lot easier for people to share and receive information.