what is the usage of Robots.txt file?

The Robots.txt file is used to restrict the search engine crawlers from indexing the selected (Private, confidential and admin pages)areas of your website.

Keyboard Short Cuts for New Twitter

The shortcut keys of new Twitter is following

Actions

Favorite : f
Reply : r
Retweet : t
Direct Message : m
New Tweet : n
Toggle Details Pane : enter

Navigation

Next Tweet : j
Previous Tweet : k
Page down : space
Search : /
Refresh Tweets And Back To Top : .

Timelines

Home : g h
Replies/Mentions : g r
Profile : g p
Favorites : g f
Messages : g m
Go To User : g u

Most Important SEO Ranking Factors

The following are the most important ranking factor for SEO, this report is based on SEOMOZ

Top Ranking Factors

• Keyword Focused Anchor Text from External Links 73%
• External Link Popularity (quantity/quality of external links) 71%
• Diversity of Link Sources (links from many unique root domains) 67%
• Keyword Use Anywhere in the Title Tag 66%
• Trustworthiness of the Domain Based on Link Distance from Trusted Domains (e.g. Trust Rank, Domain mozTrust, etc.) 66%

Top Negative Ranking Factors

• Cloaking with Malicious/Manipulative Intent 68%
• Link Acquisition from Known Link Brokers/Sellers 56%
• Links from the Page to Web Spam Sites/Pages 51%
• Cloaking by User Agent 51%
• Frequent Server Downtime & Site Inaccessibility 51%

How Search Engines Parse Keywords On Your Page for Context

In order to determine a web page's relevancy for a particular search query, search engines look at a variety of different factors to understand what a web page is about. We've talked about how title tags matter, as do URLs, and meta descriptions (but much less so). Additionally, one very big factor for how a search engine determines what your web page is about is by looking at the actual text on that page as well as the various words in it and their relative frequencies. The concepts of "keyword density" relates to how frequently various keywords are seen on a given page. If the keyword is seen a lot, then it follows that that page must be talking about a topic very relevant to that keyword.

In practical terms, what this means is that using the right keywords in your post matters and you should be cognizant of that. I would caveat that with a warning that "keyword stuffing," or artificially including excess keywords on your page, can not only create a bad experience for users but also potentially raise red flags with the search engines that you may be trying to game their algorithms (and subsequently incur a punishment from them). So, make sure to keep an eye on the keywords on your page but do so in a way that preserves the user experience and doesn't try to trick the search engines in any way.

source:http://daily-seo-tip.blogspot.com