Google Pagerank is a rank of website page from 0 to 10 on the basis of quality and backlink of page.The top pagerank means page will display in organic search on top position
Google Backlinks refer to hypelinks pointing to a particular Web page. Backlinks are important to SEO, because Google considers the quality and quantity of backlinks to determine PageRank which is one of more than 200 ranking singles used by search engines to order results for a given keyword.The term indexed means Google has added the pages to its database. However, this doesn't mean the pages have all been processed for search results - formulated for page rank.
Alexa Rank is a ranking system set by alexa.com that basically audits and makes public the frequency of visits on various Web sites. The algorithm according to which Alexa traffic ranking is calculated, is simple. It is based on the amount of traffic recorded from users that have the Alexa toolbar installed over a period of three months.
Social media allow individuals and businesses to interact with one another and build relationships and communities online. When anyone join the social media channels, consumers can interact with them directly. That interaction can be more personal to users than traditional methods of outbound marketing and advertising.