title: Remove first character from a string in data frame column
body: <p>I am doing an analysis in r on tweets imported from a python script and have accidentally included the letter "b" before each tweet. It is the first character in one of the columns in the data frame. I have managed to clean up the tweets otherwise using the "stringr" package, does anyone know how to change this, in other words just get rid of the first character in the column usertweet? Here is some example code:</p>
  
  <pre><code>username = c("user1", "user2") 
  usertweet= c("b something", "b something something") 
  tweetsdf &lt;-data.frame(username,usertweet) 
  </code></pre>