Rearranging list into data.frame - r

Question

I scraped 99 user profiles from forums for my PhD research.
The output is a list with 99 elements. Since each user can decide for himself which information he or she is going to put on the profile there's a different number of information snippets attached to each element.
Here's a sample of the output (I also don't know why the numeration has all these $ and ' signs) :
$`77.1`
$`77.1`[[1]]
[1] "Username:"
$`77.1`[[2]]
[1] "*Username*"
$`77.1`[[3]]
[1] "*Username*"
$`77.1`[[4]]
[1] "Rank:"
$`77.1`[[5]]
[1] "*Rank*"
$`77.1`[[6]]
[1] "Groups:"
$`77.1`[[7]]
[1] "*Groups*"
$`77.1`[[8]]
[1] "Location:"
$`77.1`[[9]]
[1] "*Location*"
$`77.1`[[10]]
[1] ""
$`78.1`
$`78.1`[[1]]
[1] "Username:"
$`78.1`[[2]]
[1] "*Username*"
$`78.1`[[3]]
[1] "*Username*"
$`78.1`[[4]]
[1] "Rank:"
$`78.1`[[5]]
[1] "*Rank*"
$`78.1`[[6]]
[1] "Age:"
$`78.1`[[7]]
[1] "*AGE*"
$`78.1`[[8]]
[1] "Groups:"
$`78.1`[[9]]
[1] "*Groups*"
$`78.1`[[10]]
[1]"Interests in history:"
$`78.1`[[11]]
[1] "*Interests*"
$`78.1`[[12]]
[1] "Location:"
$`78.1`[[13]]
[1] "*Location*"
$`78.1`[[14]]
[1] ""
Is there a way to arrange this list into a data frame where each row consists of information from one element?
I tried to arrange them into a matrix, but this doesn't work well because the matrix needs a consistent amount of columns, which isn't given.
I would love it to look like this:
Id 1 2 3 4 5 6
1 Username: *Username* Rank *Rank* Groups: *Groups*
2 Username: *Username2* ...