Parser for Facebook

It is necessary to create a parser that will collect information in 2 stages:
1) By keywords and the specified region, find groups and record them in a file in two columns: Group name and link to it
2) By keywords, go through all posts and comments of the groups (which were collected in the previous stage) up to the specified date, collecting information in a file with columns:
1. Type (Post or comment)
2. Text of the post or comment with the matching fragment underlined
3. Link to the post (which contains keywords, or under which there are comments with keywords)
4. Publication date
5. If it is a comment, then a link to the user who left it

Functionality needed for the interface:
1. Ability to change the Facebook account in case the previous one is blocked
2. Ability to enter keywords at each stage
3. Ability to select the region for group search
4. Ability to select the publication dates of posts of interest

Also interested in the possibility of further refining the system to meet needs for an additional fee