Extracting usernames of a website thru application/programe

[[login to view URL]][1] - It is a traveler website at which travelers rate & review the hotels . Here more than 1 million Indian members who rate & review the hotels once they stayed in the respective hotels. I want all their usernames in an excel. All users URL is like that <[login to view URL]> where username is "PeeNPee". For collecting all usernames- make an application/programme so that you can extract all usernames in an excel. Deliver me excel having minimum 2 lakh INDIAN users. When you done all usernames in a column of an excel > insert formulae in excel and make 2 nd column URL of username> make this cell linkable - This work is of 10/15 min only after collecting all usernames in an excel. Option 2 - can you make an application/programme thru which I can send similar massages to all users.