What's the difference between do$.$call function and lapply function in R$.$ When we try to use search Twitter 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 video

huffingtonpost.com video

redstate.com video

dailykos.com video

talkingpointsmemo.com video

wired.com video

firedoglake.com

blogs.cnn$.$com video

talkingpointsmemo.com

blog.cnbc$.$com blogs.cnn$.$com

talkleft.com dailykos.com

myblog.com wired.com

redstate.com huffingtonpost.com

huffington.com video

ischool.uw$.$edu wired.com

blogs.cnn$.$com video

huffington.com video

jeffblog.wordpress.com

blogs.cnn$.$com video

huffingtonpost.com

$1.$ Convert the data into a adjacency matrix.

$2.$ Plot the network graph.

$3.$ What are the number of possible connections?

$4.$ Calculate the degree centrality of huffingtonpost.com.