Start by ...
Code:
select fname||lname||email unq_person,
 count(distinct web_cast_name) wc_views
group by fname||lname||email
.. to count the web casts per person.

Then ...
Code:
select wc_views,count(*) persons
from
(
select fname||lname||email unq_person,
 count(distinct web_cast_name) wc_views
group by fname||lname||email
)
group by wc_views
.. to count the number of people per number of views
There's a start for you, anyway.