Q$1.$ What's the difference between do$.$call function and lapply function in R$.$ When we try to use searchTwitter function to retrieve info from twitter, what format are the info retrieved as$?$ Is this format open? What are the advantages and disadvantages of this format?

Q$2.$ The data below represents blogs posts discussing and linking to a viral video. The data is in the format of source $=>$ link. For example,

huffington.com $=>$ video would be interrupted as

huffingtonpost.com linking directly to the video.

myblog.com $=>$

huffingtonpost.com would be interpreted as

myblog.com posting a link to a

huffingtonpost.com blog entry about the vides

$\backslash$table$[[$huffingtonpost$.$com $=>$ video,redstate.com $=>$ video$],[$dailykos$.$com $=>$ video,$\backslash$table$[[$talkingpointsmemo$.$com $=>$ video$],[$wired$.$com $=>$ video$],[$blogs$.$cnn$.$com $=>$ video$],[$blog$.$cnbc$.$com $=>$ blogs.cnn$.$com$],[$myblog$.$com $=>$ wired.com$],[$talkingpointsmemo$.$com$],[$huffington$.$com $=>$ video$],[$blogs$.$cnn$.$com $=>$ video$],[$jeffblog$.$wordpress.com $=>$