– Q. See question above. Will that apply for the complete Omer period?
A. We also wrote on question 785 the following:
“However if the day has passed, and he did not repeat verbally the count, Poskim maintain that he can still count the rest of the days with a brocho. The reason being that this situation constitutes a double doubt or s’fek sfeko to be lenient. That is maybe the Halacha follows the opinion that after missing one day you have not lost the mitzvah, and even if you did, maybe writing is indeed the same as saying. (Mekadesh Yisroel – Sefirah 31, Mitzvas Sefiras Haome 44).
Horav Shlomo Miller’s Shlit”a opinion is that although for many mitzvos and prohibitions the writing on a screen may be considered only temporary or even not writing at all, (See question 383 in this forum in regards to erasing Hashem’s name from a screen, see also question 465 and 466 in regards to e-readers) however, as far as sefira is concerned it is deemed to be writing and the ruling above would prevail. Therefore the person writing the twitter would be able to count the rest of the days with a brocho.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a.
Rabbi A. Bartfeld as revised by, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit'a